METAL-DEPOSITION AND DEACTIVATION OF HYDRODEMETALATION CATALYSTS

被引：4
作者：
WEI, J [1 ]
ZHAO, XJ [1 ]
机构：
[1] MIT,DEPT CHEM ENGN,CAMBRIDGE,MA 02139
来源：
CHEMICAL ENGINEERING SCIENCE | 1992年 / 47卷 / 9-11期
关键词：
HYDRODEMETALATION; DEPOSITION; CATALYST; STEM;
D O I：
10.1016/0009-2509(92)87119-B
中图分类号：
TQ [化学工业];
学科分类号：
0817 ;
摘要：
Nickel deposition on sulfided and unsulfided CoMO/gamma-Al2O3 hydrodemetallation catalysts were investigated. Both element mapping and X-ray microanalysis from scanning transmission electron microscopy showed that the elemental distribution of deposited nickel were correlated with metal distributions of cobalt, but not with elemental distributions of molybdenum. The probable reason for the preferentiality is migration of the nickel deposition rather than deposition kinetics. Random sphere model calculations showed that segregated large crystallites of nickel deposition lead to less deactivation, in comparison with uniform layers of nickel deposition.
引用
收藏
页码：2721 / 2726
页数：6
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